Paper-bag machine



(No Model.) 2 Sheets-Sheet 1. W. B. PURVIS.

PAPER BAG MACHINE. v No. 430,684. Patented June-24 1890.

INVENTOR= (No ModeL) 2 Sheets-Sheet 2.

' W. B. PURVIS. v

PAPER BAG MAGHINE.

No. 430,684. Patented June 24, 189.0.

wrrmzssam INVENTOR:

. provided with irregularly-formed faces to im- UNITED STATES PATENTOFFICE.

\VILLIAM B. PURVIS, OF PHILADELPHIA, PENNSYLVANIA.

PAPER-BAG MACHlNE.

SPECIFICATION forming part of Letters Patent No. 430,684, dated June 24,1890.

Application filed January 10, 1889.

To all whom it may concern.-

Be it known that I, WILLIAM B. PURVIs. a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented a new and useful Paper-Bag Machine, of whichthe following is a specification.

My invention relates to paper bag machines, or, more specifically, tothe mechanism for forming the bottoms of the paper bags, as is fullydescribed and shown in the following specification and drawings.

My invention is intended to form the so called satchel-bottoms uponpaper bags formed with bellows side folds.

My invention consists of certain mechanism operating by suction to drawout the paper tube into the desired shape of the satchelbottom, intowhich it is finally flattened and folded. It is not concerned with themachine by which the bellows sidefold tubes are formed. The tubes formedwith bellows side folds are conducted upon endless aprons or carriersbetween formers, from which the air is exhausted or sucked by suitablemeans, thereby drawing the ends of the tube out against the sides of theformers, which are part the desired folds to the ends of the bag, whichare finally flattened down and pasted to form the sealed satchel-bottom.

Referring for greater particularity to the drawings, Figure 1 is a sideelevation of a portion of a paper-bag machine embodying the principlesof my invention. Fig. 2 is a plan view of the same. Fig. 3 is across-sectional view on line 00 0c of Fig. 2. Fig. 4 is a longitudinalsectional view of the formers through the line y y of Fig. 3. Fig. 5 isa perspective view, on an enlarged scale, of the formers separated toshow the passage of the paper tubes through them and the formation ofthe satchel-bottom; and Figs. 6 and 7 are views of the completed bag.

A A are endless aprons or carriers running in contact with each otherover rollers B, supported in a suitable manner upon the main frame 0. Iprefer to journal the shafts of these rollers in uprights upon theframe.

D D are the formers constructed with corresponding parts and supportedupon the main frame on one side of the endless aprons Serial No.295,971. (No model.)

with a small space between them to receive the end of the tube which isto be formed into the satchel-bottom. These formers are boxshaped, andhave a vertical portion (Z and a horizontal portion (1, the former ofwhich is longer than the latter portion and thicker at one end than atthe other, having a curved surface at the thicker end graduallydiminishing. The innersurface of these formers are provided with a largenumber of holes or per forations through which the air may be sucked bythe pipes E, connecting with any suitable vacuum-creating device F.These formers D D are made with compartments G G G, closed from eachother by the partitions g, and into each of these compartments separatepipesE lead provided with valves 6, so that the suction may be varied atdifferent portions of the surface of the formers D D. H is thepasting-roller, I the folder, and J J the flatteningrollers. The papertubes with the bellows side folds are carried between the endless apronsA A, between the formers D D, and the suction therein created throughthe tubes E draws up the ends of the bag K against the faces of theformer, as shown in Fig. 5. As the tubes continue to move, the ends aredrawn farther apart, and upon reaching the second position (shown inFig. 5) they are bent and drawn into the box shape by the suction uponthe faces cl and d',respectively, of the formers D D and the grooveformed between those faces. From this square box shape the ends arereadily drawn into the folds shown in the third and fourth positions inFig. 5 by the suction of the former. The bag then passes under thepasting-roller H, the folder I, and the flattening-rollers J J, fromwhich it emerges in the form shown in Fig. 7.

The important feature in this operation is the drawing out of thebellows side folds and forming the square box shape, which isaccomplished by the groove between theportions d and d of the formers;and I find it very advantageous to make that groove at about the centerof its length with this slit or opening M, Fig. 5, through which the airis sucked or drawn. This groove forms thenecessary crease to break theends of the tube into the square box shape to form the satchelbottom,and by making the groove with this slit or opening as described theoperation is more effectively performed. If desired, the portions (Z andd may be made separate, forming an opening in the groove between 5 them,and the parts may be made adjustable to increase or diminish the widthof the opening in the groove. Small wires 70 may be stretched(preferably in a slanting or oblique direction) across the upper andfront por- IO tion of the formers to aid in forming the square boxshape; but this is of course not essential to my invention, nor is theexact shape of the formers important if the general shape is such asdescribed as necessary to make the required folds in the end of thepaper tube. A hood or enveloping cover L may be secured over the rearends of these formers D D to form a compartment between the two formers,and thus aid the flow of the air.

The mere details of construction which are here shown are manifestlycapable of modification without departing from the principles of myinvention, and are therefore not to be considered limitations of it.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a machine for forming bottoms of pa per bags, two box-shapedformers between which the paper tubes to be formed are fed, havingperforated surfaces and grooves ex tending longitudinally therein, incombination with means, substantially as described,

3 5 to suck the air through said perforations and draw the ends of thepaper tubes against the faces of the formers.

2. In a machine forforming bottoms of pa per bags, two box-shapedformers between which the paper tubes to be formed are fed,

having perforated surfaces and grooves extending longitudinally therein,in combination with means, substantially as described, to suck the airthrough said perforations and 45. draw the ends of the paper tubesagainst the faces of the formers, and a carrier to carry the paper tubesbetween the formers.

3. In a machine for forming a satchel-bottom on a bellows side-foldtube, the combination of two hollow formers between which the end of thepaper tube is fed, said formers having curved faces provided with holesor perforations, through which the air is sucked to draw the ends of thepaper tube up against 5 5 the faces of the formers, and a groove in eachof said faces, into which the end of the-tube is drawn to form thesatchel-bottom, said groove having a slit or opening in the direction ofits length into the interior of the formers.

which the paper 4. In a machine for forming a satchel-bottom on abellows side-fold tube, the combination of two hollow formers, betweenwhich the end of the paper tube is fed, said formers having curved facesprovided with holes or perforations, through which the air is sucked todraw the ends of the paper tube up against the faces of the formers, agroove in each of said faces, into which the endsof the tube are drawnto form the satchel-bottom, and pasting devices to apply paste to theends of the folded tube, and a folder to fold said pasted ends over uponeach other.

5. A former for forming the bottoms of paper bags by suction, consistingof two similar. box-shaped portions arranged opposite to each other,each having a curved face provided with perforations or holes and alongitudinallyextending groove therein, saidv boxshaped portions beingdivided into compart- 8o ments closed to each other, in combination withmeans, substantially as described, to exhaust the air from any or all ofsaid compartments.

6. Aformer for forminga satchel-bottom'on a paper bag, consisting of twosimilar and oppositely-arranged box-shaped formers, each having thevertical portion (Z, with a curved and gradually-receding surface, andthe horizontal portion 01, said portions d and d havo ing a longitudinalgroove or depression between them and being provided with perforatedsurface, through which the air is sucked to draw the edge of the papertube against said surfaces of the former. 5

7. In a machine for forming bottoms of paper bags, two box-shapedformers, between tube to be formed is fed, having perforated surfacesand grooves extending longitudinally therein, in combina- IOO tion withmeans to create a suction through said perforated surfaces, and a hoodor cover extending partly over said formers.

8. In a machine for forming bottoms of paper bags, two box-shapedformers, between I05 which the paper tube to be formed is fed, havingperforated surfaces and grooves ex tending longitudinally therein, incombination with means to create a suction through said perforatedsurfaces, and wires arranged 11o transversely upon said faces of theformers to present a roughened surface, over which the paper tube is topass to aid the formation of the bottom.

In testimony of which invention I hereunto I I 5 set my hand.

WILLIAM B. PURVIS.

Witnesses:

BUTLER KENNER HARDING, ABNER J. DAVIS.

